577
FXUS65 KBYZ 130718
AFDBYZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
118 AM MDT SAT JUN 13 2026
KEY MESSAGES
- BLANKET AREAS OF RAIN END FROM NORTH TO SOUTH EARLY TODAY. A FEW
SHOWERS COULD LINGER OVER THE PLAINS IN THE AFTERNOON.
- LIGHT SNOW ACCUMULATIONS ARE EXPECTED IN THE MOUNTAINS THROUGH
THIS MORNING WITH IMPACTS TO RECREATION AND TRAVEL, INCLUDING
THE BEARTOOTH HIGHWAY.
- WARMING AND MOSTLY DRY CONDITIONS SUNDAY THROUGH TUESDAY.
DISCUSSION
NEXT 7 DAYS (THROUGH FRIDAY)...
AREAS OF PRECIPITATION (60-90% CHANCE) WILL GRADUALLY MOVE SOUTH
THIS MORNING AND EXIT THE REGION BY THIS AFTERNOON. WEAK
INSTABILITY OVER THE REGION MAY ALLOW FOR A FEW RUMBLES OF
THUNDER. ISOLATED SHOWERS (10-30% CHANCE) MAY LINGER OVER THE
MOUNTAINS AND NEARBY PLAINS THROUGH THIS AFTERNOON. PRECIPITATION
TOTALS LOOK TO RANGE FROM A FEW HUNDREDTHS TO A TRACE OVER THE
NORTH, TO BETWEEN 0.50 TO 0.75 INCHES OF PRECIPITATION, WITH
LOCALLY HIGHER TOTALS OVER THE NORTHERLY UPSLOPE REGIONS OF THE
SOUTHERN MOUNTAINS AND FOOTHILLS. THERE IS A MODERATE TO HIGH
CHANCE OF AT LEAST 0.25 INCHES OF PRECIPITATION SOUTH AND WEST OF
A MELVILLE TO BILLINGS TO ALZADA LINE.
OVER THE MOUNTAINS, SNOW LEVELS WILL FALL TO AROUND 7,500 FEET
THIS MORNING, AND THE HIGHER PEAKS ABOVE 9,000 FEET CAN EXPECT
SEVERAL INCHES OF SNOW. SNOW WILL LIKELY IMPACT THE BEARTOOTH
HIGHWAY AND A WINTER WEATHER ADVISORY REMAINS IN EFFECT THIS
MORNING. BE PREPARED FOR IMPACTS TO RECREATION AND TRAVEL IN THE
HIGH COUNTRY!
TONIGHT INTO SUNDAY MORNING, FROST WILL BE A CONCERN FOR LOCATIONS
OVER THE FOOTHILLS AND HIGHER HILLS AS TEMPERATURES DROP INTO THE
MID 30S. CURRENTLY, THE HIGHEST CHANCE IS 30-50% OVER THE
SHERIDAN FOOTHILLS. SENSITIVE VEGETATION MAY BE AFFECTED!
CONDITIONS TREND DRIER THROUGH MONDAY, OUTSIDE OF OCCASIONAL
PIECES OF ENERGY BRINGING ISOLATED SHOWER AND WEAK THUNDERSTORM
ACTIVITY TO THE REGION IN THE AFTERNOONS/EVENINGS. BY LATE
TUESDAY INTO WEDNESDAY, A MORE ACTIVE WAVE IS POSSIBLE UNDER UPPER
LEVEL NORTHWEST FLOW. OCCASIONAL PIECES OF ENERGY WILL CONTINUE TO
MOVE THROUGH THE FLOW THROUGH THE END OF THE WORK WEEK, ALLOWING
ISOLATED AFTERNOON/EVENING SHOWERS AND THUNDERSTORMS TO CONTINUE.
ARCHER
AVIATION
EXPECT AREAS OF RAIN ALONG WITH HIGH ELEVATION SNOW ACROSS MUCH
OF THE ROUTES THROUGH 12Z. MVFR CONDITIONS WILL ACCOMPANY THE
PRECIPITATION INCLUDING KLVM/KBIL/KSHR WITH OCCASIONAL IFR
CONDITIONS POSSIBLE, ESPECIALLY ALONG THE SOUTHERN FOOTHILLS
(KSHR). FURTHER EAST ISOLATED TO SCATTERED MAINLY LIGHT SHOWER
ACTIVITY IS EXPECTED INTO THE MORNING HOURS, BUT CONDITIONS WILL
REMAIN MAINLY VFR, WITH OCCASIONAL MVFR CONDITIONS MAINLY ALONG
THE MT/WY BORDER ZONES. MOUNTAINS WILL BE OBSCURED THROUGH AT
LEAST MID DAY.
THE PRECIPITATION WILL DECREASE FROM NORTH TO SOUTH DURING THE
MORNING WITH SLOWLY IMPROVING CEILINGS BY 18Z. ISOLATED SHOWERS
ARE POSSIBLE DURING THE AFTERNOON WITH LITTLE COVERAGE OR IMPACTS
EXPECTED. BT
PRELIMINARY POINT TEMP/POPS
TDY SUN MON TUE WED THU FRI
-------------------------------------------------------
BIL 064 044/071 046/081 056/088 060/077 050/079 053/084
5/W 00/U 00/B 00/N 11/N 01/U 01/U
LVM 061 037/069 041/078 049/085 052/077 044/079 046/083
7/W 10/U 00/B 00/N 01/N 00/U 01/U
HDN 065 040/071 042/079 051/087 056/075 047/078 050/083
4/W 00/U 00/B 00/N 12/W 11/U 00/B
MLS 065 044/072 047/077 052/082 054/071 048/074 050/080
1/B 00/B 00/B 01/B 45/T 12/W 00/B
4BQ 062 042/069 045/075 051/082 056/072 048/075 050/082
7/W 00/U 00/U 01/B 23/T 11/U 00/U
BHK 062 039/070 043/073 046/077 050/068 043/071 045/078
1/N 00/B 01/N 12/W 56/T 22/W 10/B
SHR 059 036/065 038/073 046/082 052/073 043/075 046/081
+/W 11/B 00/N 00/N 12/T 01/U 11/U
BYZ WATCHES/WARNINGS/ADVISORIES
MT...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON MDT TODAY FOR
ZONE 67.
WY...NONE.
WEATHER.GOV/BILLINGS
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